Improvement in pumps



t UNITED STATES `v PATENT Eric-5E.

CHARLES F. BELLOVS, OF SENECA FALLS, NEV YORK.

IMPROVEMENT IN PUMPS.

To @ZZ whom t may concern:

Be it known that I, CHARLES F. BELLows, of Seneca Falls, in the county of Seneca, in the State of New York, have invented a new and Improved Pump for Raising and Forcing lVater; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

The nature of my invention consists in providing two sets of screws or two double screws of suitable diameter, one set of which is composed of what is usually termed a right hand and a left-haut screw on the same axis, and the other set is also composed of a right-hand and a left-hand screw 'on the same axis, as represented in Figure 2in the plate, and arranging them in such a manner as that the threads on one set of screws will move in t-he grooves of the other set as they revolve on their respective axes, and then placing the screws thus arranged in a case or box fitted to their peripheries as nearly water and air tight as will admit of their free revolution, and so gearing the screws together outside of the case that whatever motion is communicated to one will be given to the other also, but in an opposite direction, the result or effect of which arrangement when the screws are made to revolve is a tendency to produce a vacuum at the center part of the cylinder or case and of the grooves of the screws marked K K, Fig. 2, and to force or expel the air from both ends of the case in which the screws revolve, so that when a tube communicating with the center part of the case in which there is a tendency to produce a vacuum is immersed in water the revolution of the screws will cause the water t-o rise in the tube and into the case or box andthe grooves of the screws, from whence itis forced or expelled by the revolution of the screws each way from the center to the ends of the case or cylinders, and thereby constituting what is usuallydenominated a suction and force pump. These screws may be revolved either way, producing the same result; but the course of the water through the case or pump will depend upon the direction that the screws are caused to revolve, in the one case making the center of the case theinlet of the water and the two ends the discharge, and in the other case making the two ends the inlets of the water and the center the discharge.

To enable others skilled in the art to make and use my invention, I will proceed to dcscribe its construction and operation. I construct a right-hand screw and a left-hand screw of cast-iron or other suitable material and diameter, with a thread of proper sizesay of half an inch thick on the face and three-quarters of an inch deep from the outer surface or perimeter-to the body of the screw, with a distance between the threads enough greater than the thickness of the thread itself to allow the thread of one screw to work in the groove of the other without friction, or with as little as possible, and of sufficient length to contain two whole threads on each screw. Iplace these two screws (right and left hand) on the same axle.. These dimensions may be varied according to the required capacity of the pump. I also construct another set of screws, similar every way to the first set, and place them on another axle, so arranging them that the right-hand screw on one axle will match with a left-hand screw on the other axle when the two axles and their screws are placed in working position, as in Fig. 2 of drawings. The axles are of sufcient length so that the ends will project sufficiently beyond the screws to furnish a bearing at one end for the screws to run on when in their caso, and at the other end to aiford an opportunity to gear the axles with their screws together outside of the case by means of cog-wheels, as represented in the accompanying drawings, Fig. 2, A A. I construct the box or case in which the above-described screws work of two pieces of cast-iron or other suitable material as follows: First the main part or body of the case F G G, Fig. l, I make of cast-iron in one piece of an oval shape and with a cavity of such a shape and of such dimensions as will "just receive the two screws orsets of screws when placed in working position with the Vthreads of one in the grooves of the other, as represented in the drawings, Fig. 2, without allowing or causing any rubbing or friction between the screws and the box or case, except the bearings of the axles with two orifices or holes at the two centers E E, Fig. l, of the cavity or case for the projecting axles of the screws to Work in. The other part of the case or box marked B B, Fig. 2, I make of a single piece of cast-iron or other suitable material of the same shape and size of the mainpart above described and of sufficient thickness to give the required strength for any given-sized pump Wit-h holes around the outer edge, as shown in the accompanying drawings, for connecting to the other a main part of the case by means of screws. The

suction or inlet pipe for the water is attachedY at H, Fig. 2, and of sutticient capacity to al loWthe Water to pass out ot' the case vor box as fast as it is supplied.

That I claim as my invention, and desire to secure by Letters Patent, is-

The arrangement and construction of a pump, as above set forth, by means of righthanded and letthanded screws, the threads of one operating within those of the other, as above described, or other mode substantially the same.

CHARLES F. BELLOWS. Witnesses:

S. L. MONROE,

E. H. WALDo. 

